Re: [Ntop-misc] Mac Pro and n2disk

Sun, 03 Aug 2014 01:16:25 -0700

Hi Luca,
This means that you were able to reach a writing speed of 20 Gbps on the same controller using only 10 HDDs of 10K rpm.
Is that true?

My calculations show that with 10 HDDs of 10K rpm, with a writing speed of approx. 200 MB/s you can only reach 2 GB/s (~16 Gb/s), which is not enough.

Best,
Tory

Sent: Thursday, July 31, 2014 at 6:24 PM
From: "Luca Deri" <[email protected]>
To: [email protected]
Subject: Re: [Ntop-misc] Mac Pro and n2disk
Tony
this happens as Napatech is doing something smart to collapse packets together into a single PCI transfer, so that we put less stress on the PCIe bus and thus we can avoid having two controllers and moreover a pcap file per device.

Cheers Luca

On 31 Jul 2014, at 17:00, Tory Backalbat <[email protected]> wrote:

Hi Luca
Why does the Napatech card enable writing to one partition? isn't the writing throughput still limited?

Tory

Sent: Thursday, July 31, 2014 at 11:18 AM
From: "Luca Deri" <[email protected]>
To: [email protected]
Subject: Re: [Ntop-misc] Mac Pro and n2disk
Tory,
we have recorders that do 20G to disk, If you use Intel NICs you need to use 2 n2disk instances that write to 2 partitions (hence youi need two controllers). With Napatech cards you can save everything onto the same partition. Note that in the first case, our extraction tools merge the two ports packets, whereas on the second case a dumped pcap is already "ready to use". For 10G you need at least 8x10K RPM SATA drives (10 are better).

Luca

On 07/31/2014 09:35 AM, Tory Backalbat wrote:
Hi
 
Thanks Luca for your answer, I think I'll go on the direction of a rack mounted server.
So if I want to create a wire-rate recording server with n2disk for 2X10 Gbps, do you think one raid controller would be enough, or should I use 2 seperate controllers?
Is there a risk of an I/O bottleneck?
 
Regards,
Tory
 
Sent: Monday, July 28, 2014 at 7:30 PM
From: "Luca Deri" <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [Ntop-misc] Mac Pro and n2disk
Hi Tory
N2disk works on OSX but for 10g you need to use Linux. We know people who have tried thunderbolt and the outcome is that the performance is suboptimal (I have seen a report during the sharkfest conference) so I think OSX is not yet a viable alternative to Linux both in performance and price
 
Regards Luca 

Sent from my iPhone (sorry for typos)

On 28/lug/2014, at 17:09, "Tory Backalbat" <[email protected]> wrote:
 
Hi guys,
 
I'm trying to assemble a multi-gigabit packet capture machine that is both portable and able to capture traffic of up to 2X10 Gbps.
The requirement of portability (small and light) is essential and so the natural choice is the mac pro with it's high performance and small size, using a PCIe cage with thunderbolt and intel's 10 Gbps NIC.
Also - wanting to be able to capture highspeed capture I'm aiming at using pf_ring, dna and n2disk. To do that I'll need to run ubuntu/centos natively on the Mac pro.
 
Does anyone have any experience with that kind of setup or with running pf_ring on an apple machine?
To the ntop team- do you have experience with using pf_ring, dna on a NIC through a thunderbolt interface? and- has pf_ring been tested on apple devices?
Is that theortically possible?
 
Thanks in advance,
Tory
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